The car has 173K miles on it, yes the check engine light comes on periodically, and stays on for a few hours to a few days, after the plugs and wires were changed the car would not start again so it was taken to someone who could put it on the computer and that is what came up for the codes, something about it was almost all the way bad. I have been having the low gas mileage problem for about six months, thats when i changed the fuel filter, didnt get any better, then it started not starting, thats when i changed the plugs and wires over this past weekend. it wouldnt start on me again today. i think it has gone into the fail safe mode cause it has no get up and go and if i do try to get over fifty its like i dont even have my foot on the gas, almost like its in neutral, i reset the tach every time i fill my tank and have not seen 200 miles or more in a full tank in a very long time. usually ranges between 180 and 187 per full tank. do you have any other suggestions about what could be wrong before i climb into this mess? I'm a girl who doesn't mind getting dirty to fix it i would just rather not fix something that may not be broken and working on electrical stuff in the car scares me any way! Thank you for taking the time to read my book lol!